单项选择题

Our Internet shopping site guarantees a free delivery service within 24 hours if the order is received before noon ______ your money back.

(A) if
(B) nor
(C) unless
(D) or
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单项选择题
Cash and credit cards are usually the ______ means of payment in our store, but we do net accept personal checks.
(A) preferring
(B) preferred
(C) preference
(D) preferable
单项选择题
Your quick comments on our services are needed to make our company more customer-friendly ______ will assist us in serving you more efficiently.
(A) what
(B) so that
(C) which
(D) and
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